6.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Xueshi Hu <xueshi.hu@xxxxxxxxxx>
[ Upstream commit 992db13a4aee766c8bfbf046ad15c2db5fa7cab8 ]
Raid1 reshape will change mempool and r1conf::raid_disks which are
needed to free r1bio. allow_barrier() make a concurrent raid1_reshape()
possible. So, free the in-flight r1bio before waiting blocked rdev.
Fixes: 6bfe0b499082 ("md: support blocking writes to an array on device failure")
Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Signed-off-by: Xueshi Hu <xueshi.hu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230814135356.1113639-3-xueshi.hu@xxxxxxxxxx
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/md/raid1.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index e51b77a3a8397..ebbe41a33b821 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1370,6 +1370,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
return;
}
+ retry_write:
r1_bio = alloc_r1bio(mddev, bio);
r1_bio->sectors = max_write_sectors;
@@ -1385,7 +1386,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
*/
disks = conf->raid_disks * 2;
- retry_write:
blocked_rdev = NULL;
rcu_read_lock();
max_sectors = r1_bio->sectors;
@@ -1465,7 +1465,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
for (j = 0; j < i; j++)
if (r1_bio->bios[j])
rdev_dec_pending(conf->mirrors[j].rdev, mddev);
- r1_bio->state = 0;
+ free_r1bio(r1_bio);
allow_barrier(conf, bio->bi_iter.bi_sector);
if (bio->bi_opf & REQ_NOWAIT) {
--
2.40.1
